/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __CUTILS_SOCKETS_H
#define __CUTILS_SOCKETS_H

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#ifdef HAVE_WINSOCK
#include <winsock2.h>
typedef int  socklen_t;
#elif HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#define ANDROID_SOCKET_ENV_PREFIX	"ANDROID_SOCKET_"
#define ANDROID_SOCKET_DIR		"/dev/socket"

#ifdef __cplusplus
extern "C" {
#endif

	/*
	 * android_get_control_socket - simple helper function to get the file
	 * descriptor of our init-managed Unix domain socket. `name' is the name of the
	 * socket, as given in init.rc. Returns -1 on error.
	 *
	 * This is inline and not in libcutils proper because we want to use this in
	 * third-party daemons with minimal modification.
	 */
	static inline int android_get_control_socket(const char *name)
	{
		char key[64] = ANDROID_SOCKET_ENV_PREFIX;
		const char *val;
		int fd;

		/* build our environment variable, counting cycles like a wolf ... */
#if HAVE_STRLCPY
		strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
				name,
				sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
#else	/* for the host, which may lack the almightly strncpy ... */
		strncpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
				name,
				sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
		key[sizeof(key)-1] = '\0';
#endif

		val = getenv(key);
		if (!val)
			return -1;

		errno = 0;
		fd = strtol(val, NULL, 10);
		if (errno)
			return -1;

		return fd;
	}

	/*
	 * See also android.os.LocalSocketAddress.Namespace
	 */
	// Linux "abstract" (non-filesystem) namespace
#define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0
	// Android "reserved" (/dev/socket) namespace
#define ANDROID_SOCKET_NAMESPACE_RESERVED 1
	// Normal filesystem namespace
#define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2

	extern int socket_loopback_client(int port, int type);
	extern int socket_network_client(const char *host, int port, int type);
	extern int socket_loopback_server(int port, int type);
	extern int socket_local_server(const char *name, int namespaceId, int type);
	extern int socket_local_server_bind(int s, const char *name, int namespaceId);
	extern int socket_local_client_connect(int fd, 
			const char *name, int namespaceId, int type);
	extern int socket_local_client(const char *name, int namespaceId, int type);
	extern int socket_inaddr_any_server(int port, int type);

#ifdef __cplusplus
}
#endif

#endif /* __CUTILS_SOCKETS_H */ 
